More powerful CLI

[Michael-F-Bryan]

I thought I'd try this out when writing a toy static analyser. Although I've got it hooked into my build.rs, it'd be nice if the tango command were a bit more powerful and gave you more control over what happens.

Some possible subcommands:

• tango build - generates the Rust code once
• tango clean - removes generated files
• tango watch - watches the src/ directory for changes (probably using watchexec) and automatically regenerates the Rust code and compiles it for you

It might be useful to have a configuration file (i.e. tango.toml) that:

• lets you specify all source will be in markdown
• the destination for the generated code (e.g. target/tango/) so your src/ directory doesn't end up with loads of double-ups
• A header to add to each generated file (i.e. "generated by tango, do not edit") if we're in markdown-only mode.

If I have time I'll see if I can make a couple PRs to give the CLI tool more features and options. What are your thoughts?

Great project by the way, I really like the idea and how you've implemented it!

[pnkfelix]

hmm. yes you are probably right that we should surface any library API entry method(s) with a command line interface as well.

@Nasreen123 had started doing some work in trying to develop a new entry-point. I think I will attempt to continue with her effort.